n. , informal A large amount; much. Used with "a". Mrs. Walker's long illness cost her a good deal. George spends a great deal of his time watching television. Often used like an adverb. Cleaning up after the party took a great deal more work than the girls expected. Usually it takes Father half an hour to drive to work, but in bad weather it takes a good deal longer. Mother likes the gloves Mary gave her, and she uses them a good deal. George is a good deal like his father; they both love to eat.
Synonym: A LOT, QUITE A LITTLE.
Compare: ALL KINDS OF, GOOD MANY.
Antonym: A LITTLE.